Multiple display modes on a mobile device

ABSTRACT

A display control system for controlling visual features on a mobile device, according to one embodiment, includes a display screen disposed on a front side of the mobile device and configured to display at least one user interface element for a user. A front-facing camera disposed on the front side of the mobile device is configured to sense characteristics of the eyes of the user. A processing device processes these characteristics to determine a corresponding point on the display screen where the eyes of the user are directed. A user interface control unit switches the display screen from a regular display mode to a detailed display mode when it is determined that the corresponding point on the display screen where the eyes are directed coincides with a specific user interface element. The detailed display mode includes supplemental information related to the specific user interface element.

FIELD OF THE INVENTION

The present invention relates to systems and methods for displaying information in multiple display modes on a display screen of a mobile device.

BACKGROUND

Many advances in cellular phone technology have been made over the past several years. One such advance is the technology allowing a user to access Internet websites using a smart phone. A common problem with accessing websites on mobile devices, however, is that the size of the display screens on most smart phones is much smaller than the display screens on computers, laptops, and tablets for which most webpages are typically configured.

Smart phones with small screens may only be able to show just a small portion of a graphical page, such as a webpage, application page, operating system window, etc. The user may then need to scroll up, down, left, and right to see portions of the page a little at a time, which can be frustrating and time-consuming for a user. Alternatively, if the entire large graphical page is displayed on the smart phone screen, this too can be a problem since it can be difficult for the user to see all the minute details on the page.

The issue of adapting a large graphic page to fit into the display area of a small screen often presents a challenge to developers of user interfaces as well. Therefore, a need exists for smart phones to include a user interface that provides graphical content in a manner that is easy for the user to view and is intuitive to the user's intentions.

SUMMARY

Accordingly, in one aspect, the present invention embraces a display control system for controlling visual features on a mobile device. The display control system, in one embodiment, comprises a display screen disposed on a front side of the mobile device. The display screen is configured to display at least one user interface element for a user of the mobile device. The display control system further includes a front-facing camera disposed on the front side of the mobile device. The front-facing camera is configured to sense characteristics of the eyes of the user. Also, the display control system includes a processing device configured to process the characteristics of the eyes of the user to determine a corresponding point on the display screen where the eyes of the user are directed. A user interface control unit of the display control system is configured to switch the display screen from a regular display mode to a detailed display mode when the processing device determines that the corresponding point on the display screen where the eyes of the user are directed coincides with a specific user interface element. The detailed display mode includes supplemental information related to the specific user interface element.

In another exemplary embodiment, a mobile device comprises a body having a front side and a back side. During use of the mobile device, the front side is configured to face in a direction toward a user and the back side is configured to face in a direction away from the user. The mobile device further includes a display device disposed on the front side of the body. The display device is configured to display a plurality of user interface elements simultaneously, wherein each user interface element comprises at least one of an image element and a text element. The mobile device further includes a front-facing camera disposed on the front side of the body. The front-facing camera is configured to capture images of the eyes of the user when the user is viewing the display device. A user interface control unit of the mobile device is configured to receive images of the eyes of the user from the front-facing camera, determine a direction that the eyes of the user are pointed, and determine a corresponding point on the display device where the eyes of the user are directed. The user interface control unit is further configured to control the display device to switch between a regular display mode and a detailed display mode based on whether the corresponding point on the display device where the eyes of the user are directed coincides with one of a plurality of gaze target areas, wherein each gaze target area is associated with a respective user interface element.

In yet another exemplary embodiment, an executable program stored on a non-transitory computer-readable medium disposed in a mobile device is provided. The executable program is executable by a processing device also disposed in the mobile device. The executable program comprises logic configured for processing images of the eyes of a user of the mobile device to determine a corresponding point on a display screen of the mobile device where the eyes of the user are directed. Furthermore, the executable program comprises logic configured for controlling visual features of the display screen based on whether or not the eyes of the user are directed to a user interface element being displayed on the display screen. The user interface element is an image element and/or a text element associated with supplemental information to be displayed in a detailed display mode.

The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically depicts a front view of a mobile device displaying a user interface element in a regular display mode, according to an embodiment of the present invention.

FIG. 2 schematically depicts a front view of the mobile device of FIG. 1 displaying the user interface element in a detailed display mode, according to an embodiment of the present invention.

FIG. 3 schematically depicts the display screen shown in FIGS. 1 and 2 with gaze target areas, according to an embodiment of the present invention.

FIG. 4 schematically depicts a block diagram of a display control system incorporated in a mobile device, according to an embodiment of the present invention.

FIG. 5 schematically depicts a block diagram of the user interface control unit shown in FIG. 4, according to an embodiment of the present invention.

DETAILED DESCRIPTION

The present invention embraces user interfaces (UIs), display screens, touch screens, etc., which are incorporated into mobile devices such as cellular phones, smart phones, or other portable electronic devices. As mentioned above, there is limited screen real estate to present information to the user without cluttering the screen and providing a poor user experience.

The present invention describes embodiments of UIs having at least two visible display modes. The present invention may utilize the front-facing camera of the mobile device to detect the direction of gaze of the user. The direction of gaze can be used to determine what particular UI element the user is looking at. For the purpose of this disclosure, a UI element may refer to an element displayed on the UI, such as an image, a graphic, a button, a text box, a list box, a check box, etc.

To solve the limited screen real-estate problem, the present invention utilizes the user's gaze at a particular UI element to switch the UI from a regular display mode to a detailed display mode. For example, when a user looks at a particular UI element for more than a pre-defined amount of time, it can be determined that the user is interested in this particular element. Thus, the display mode will be “expanded” to the detailed display mode to show additional details and to dedicate more screen real estate to the interested element.

When the detailed display mode is shown and the front facing camera senses that the user looks somewhere else for a certain period of time, the UI is returned to its regular display mode. After switching back to the regular state, the present invention may also specify a configurable time period after the UI was switched back during which a glance at the interested UI element again will re-expand the display to its detailed display mode. This is to account for the scenario where a UI element is in its detailed state and the user briefly glances away from the device.

FIG. 1 illustrates an embodiment of a mobile device 10, which may be configured as a cellular phone, smart phone, or other type of portable electronic device having a user interface screen. The mobile device 10 includes a body 12 having a front side 12 a and a back side (not shown). A display screen 14 and a front-facing camera 16 are both disposed on the front side 12 a of the body 12 of the mobile device 10. The front-facing camera 16 is therefore directed generally toward the user of the mobile device 10 while the user views the display screen 14. In some embodiments, the mobile device 10 may also have a rear-facing camera (not shown) positioned on the back side of the body 12 of the mobile device 10, although the rear-facing camera is normally not utilized in the embodiments of the present invention.

The display screen 14 may be any type of device for providing visual information to the user. For example, the display screen 14 may include LED components, LCD components, and/or other suitable light components. In some embodiments, the display screen 14 may be a touchscreen that receives tactile input from a user. The display screen 14 may be part of a user interface including other input and/or output components such as buttons, switches, vibration components, etc.

As an example, FIG. 1 is shown with a user interface (UI) element 18 being displayed on the display screen 14. In this embodiment of FIG. 1, the display screen 14 displays the UI element 18 in a regular display mode. The regular display mode is a normal mode and includes a simple format for illustrating information (e.g., graphics and text) to a user. The regular display mode may be a simplified view of a graphics page (e.g., webpage, native application page, operating system window, etc.) without a large amount of extraneous information.

The UI element 18 may be any type of display element, such as an image, a graphic, a text box, a check box, etc. The UI element 18, as shown in the example of FIG. 1, is a picture of a famous arch (i.e., Delicate Arch) in Arches National Park in Utah.

The front-facing camera 16 may be configured to sense the eyes of the user as the user peruses the graphic or page that includes the UI element 18. An eye-gaze monitoring unit, which is described in more detail below, is incorporated in the mobile device 10 and is configured to determine the direction of the user's gaze from images captured by the front-facing camera 16. When the user gazes at the UI element 18 or a specific portion of the UI element 18, a control unit incorporated in the mobile device 10 changes the display screen 14 from the regular display mode to an expanded state or detailed display mode.

FIG. 2 shows the mobile device 10 of FIG. 1 when the display screen 14 presents content of the graphical page in the detailed display mode. This mode is displayed in response to the user gazing at the UI element 18 or a portion of the UI element 18. The UI element 18 may be “expanded” to include not only the original UI element 18 but also a supplemental information window 22 or other form for providing supplemental information related to the UI element 18. The display screen 14 is configured to continue displaying in the detailed display mode (with the supplemental information window 22) as long as the user continues to gaze at the UI element 18 or supplemental information window 22.

The expansion of the detailed display mode (FIG. 2) from the regular display mode (FIG. 1) may include any suitable type of transition processes. For example, the supplemental information window 22 may be displayed as a pop-up window superimposed over other non-selected UI elements. In other embodiments, the supplemental information window 22 may slide into place from any direction or expand from a single point. The transition may include other methods for showing the supplemental information window 22. Also, other types of windows besides the supplemental information window 22 may additionally or alternatively be displayed for illustrating supplemental information related to the UI element 18.

FIG. 3 illustrates the display screen 14 of the mobile device 10 of FIGS. 1 and 2, wherein gaze target areas 30, 32, and 34 are depicted. The gaze target areas 30, 32, and 34 are represented as dashed lines to indicate that they are not necessarily visible to the user. Instead, the gaze target areas 30, 32, and 34 may simply represent areas on the display screen 14 where the user's gaze to be perceived as an interest in a particular UI element.

Each gaze target area 30, 32, 34 may represent one or more UI elements. Therefore, when the user gazes on one particular gaze target area (e.g., gaze target area 32 representing “Arches National Park”), it can be determined that the user is interested in receiving more information about this UI element 18. At this point, the display screen 16 may be switched from the regular display mode (FIG. 1) to the detailed display mode (FIG. 2) to show the supplemental information about Arches National Park.

According to some embodiments, the display screen 14 may depict a graphical indicator 36 corresponding to each gaze target area 30, 32, 34. The graphical indicator 36 may be displayed for the user's benefit to indicate that the UI element 18 is gaze-enabled. In other words, the graphical indicator 36 shows the user that additional information is available if the user gazes at a particular gaze target area 30, 32, 34. The graphical indicator 36 may be shown as an “eye” symbol or as any other suitable image, symbol, word, letter, etc.

When the graphical indicators 36 are used with the gaze target areas, the graphical indicators 36 may be displayed at any position with respect to the gaze target areas 30, 32, 34. For example, graphical indicators 36 may be centered within the gaze target areas 30, 32, 34 or placed in a corner (e.g., the upper right-hand corner) of the respective gaze target area 30, 32, 34.

In this particular example of FIG. 3, the specific gaze target area 32 corresponding to the UI element 18 (i.e., the picture of the Delicate Arch) may include a size that is different from the size of the actual UI element 18. In this example, the gaze target area 32 is positioned where the text “Arches National Park/Arches, Utah” is displayed on the UI element 18.

The gaze target areas 30, 32, 34 may be similar to highlighted areas of a page where a user may select a path to a new page or to access additional information, such as by using a mouse cursor and button or by touching the element on a touchscreen device. However, instead of selection by positioning a cursor or by touching a screen, the present invention is responsive to the user directing his or her gaze at a particular element.

FIG. 4 is a block diagram illustrating an embodiment of a display control system 40 for controlling a display screen (e.g., display screen 14) of a mobile device (e.g., mobile device 10). The display control system 40 is configured to be contained within and/or mounted on the body 12 of the mobile device 10. In this embodiment of FIG. 4, the display control system 40 includes at least a processing device 42, a memory 44, an image capture device 46, and user input/output devices 48. For example, the display screen 14 shown in FIGS. 1-3 is one of many user input/output devices 48. The processing device 42, memory 44, image capture device 46, and user input/output devices 48 are interconnected and in communication with the other components via a bus interface 50.

The processing device 42 may comprise one or more processors, microprocessors, or other processing components for controlling the operations of the display control system 40 and may, in some embodiments, be configured to also control the overall operations of the mobile device 10. The memory 44 may contain any combination of volatile and non-volatile memory elements for electronically storing information, data, computational values, and/or software.

Computer programs and applications may be stored in the display control system 40 in software and/or firmware form. In other embodiments, the programs and applications may be contained at least partially in hardware form in the processing device 42. According to some embodiments, the memory 44 may contain a UI control unit 52 entirely in software and/or firmware. In other embodiments, the UI control unit 52 may be at least partially configured as hardware in the display control system 40. The processing device 42 executes the UI control unit 52 to perform the functions of controlling the images, graphics, text, etc. provided on the display screen 14. In particular, the UI control unit 52 enables the mobile device 10 to provide multiple display modes based on user intent as determined by eye-tracking characteristics.

In some embodiments, the display control system 40 may be manufactured with the mobile device 10. According to other embodiments, the UI control unit 52 may be uploaded into an existing mobile device 10 that already comprises a suitable processing device, memory, image capture device, and display screen. The UI control unit 52 may include software and/or firmware that is configured to operate with one or more of a plurality of different types of mobile devices. For example, certain programming operations may be compatible with an ANDROID brand phone platform while other programs, having similar functions as defined in the present disclosure, may be compatible with an APPLE brand phone platform.

FIG. 5 is a block diagram illustrating an embodiment of the UI control unit 52 shown in FIG. 4. In this embodiment, the UI control unit 52 comprises a graphics buffer 54, an eye-gaze module 56, a UI element position monitoring module 58, and a display mode switching module 60. The graphics buffer 54 may include memory allocated to temporarily store elements that are displayed on the display screen 14 as well as other elements that may be displayed on the display screen 14 as dictated by the user's eye-gazing actions.

The eye-gaze module 56 may include any suitable processing components for receiving images of the user's eyes and processing the images to determine the direction of gaze of the eyes with respect to the display screen 14. Therefore, the eye-gaze module 56 is capable of determining where on the display screen 14 the user is focusing his or her gaze at any particular moment.

The UI element position monitoring module 58 is configured to monitor where the UI elements are positioned on the display screen 14 at any moment. Also, the UI element position monitoring module 58 may track the location of the gaze target areas 30, 32, 34 associated with the various UI elements.

The display mode switching module 60 is configured to receive information from both the eye-gaze module 56 and UI element position monitoring module 58. The display mode switching module 60 continuously processes this information to determine if the eye-gaze position coincides with one of the UI element positions. In other words, the display mode switching module 60 determines if the user is looking at a particular UI element. In addition to determining the overlap of eye-gaze and UI element positions, the display mode switching module 60 also tracks the time periods that the user's gaze is directed to the UI elements and the time periods when the user looks away.

According to a first scenario, the display screen 14 displays information in the regular display mode (FIG. 1). When the display mode switching module 60 determines that the user gazes at a particular UI element (e.g., UI element 18) or gaze target area (e.g., gaze target area 32) for a predetermined amount of time (e.g., about two seconds), the display mode switching module 60 switches from the regular display mode (FIG. 1) to the detailed display mode (FIG. 2).

A second scenario is analyzed when the display screen 14 is already in the detailed display mode resulting from an eye-gaze event described with respect to the first scenario. In the second scenario, the display mode switching module 60 determines whether or not the user's gaze is turned away from the UI element 18, gaze target area 32, or supplemental information window 22 for a predetermined amount of time (e.g., about two seconds). If so, the display mode switching module 60 switches back to the regular display mode (FIG. 1).

A third scenario involves a predetermined time period after the display mode switching module 60 switches the display screen 14 from the detailed display mode (FIG. 2) back to the regular display mode (FIG. 1) resulting from the user looking away from the UI element 18, gaze target area 32, or supplemental information window 22 as described with respect to the second scenario. The predetermined time period associated with the third scenario allows the display screen to return back to the detailed display mode if the user looks away for only a short amount of time. For example, if the user returns his or her gaze to the UI element 18, gaze target area 32, or supplemental information window 22 within the time period (e.g., about two seconds), the display mode switching module 60 switches immediately back to the detailed display mode (FIG. 2).

The predetermined time periods for each of the three scenarios may be about two seconds. However, in some embodiments, the time periods for each may be user-configurable to enable the user to customize how the display modes are enabled. For example, the times periods may be configurable to range from zero seconds (i.e., instantaneous) to 10 seconds or longer.

Depending on which mode the display mode switching module 60 has enabled, the UI elements and display elements (e.g., pictures, graphics, text, etc.) stored in the graphics buffer 54 are retrieved from the graphics buffer 54 and transmitted to the display screen 14. Therefore, the graphics buffer 54 may contain any combination of UI elements, supplemental information related to the UI elements, supplemental information windows, etc. The various display elements may be added or removed from the display screen according to the operations of the display control system 40.

In order to provide eye-gaze functionality and UI control functionality according to the teachings of the present disclosure, a certain platform (e.g., ANDROID brand) shall be selected. A subclass is created of all UI elements that the functionality will be applied to. The user interface controlling functionality of the mobile device 10 may be overridden to enable the UI control functionality disclosed herein. For example, the UI elements can be modified to enable the display of either the regular display mode (FIG. 1) or the detailed display mode (FIG. 2). The UI control unit 52 of FIG. 5 is able to switch to the detailed display mode when a user gazes at a particular UI element for a predefined period of time.

Eye-gazing functionality is utilized to control the features of a UI (e.g., an ANDROID brand UI). The programming may generally include a command that is used when a user gazes at a certain element. Instead of including a generic “Button” in the UI, a special type of button referred to herein as a “GazeButton” is included. The GazeButton has all the properties of a “Button” plus the additional gaze enabled functionality. A similar command can be used for any of the UI elements. In object-oriented programming, a class is an extensible program-code-template for creating objects, providing initial values for state (member variables) and implementations of behavior (member functions or methods).

When a class is extended, it becomes a derivative of that class and inherits all the properties of the class plus any alterations and/or additions of its own properties. Inheritance refers to a feature of Java and other programming languages. The class from which properties are inherited are referred to as a parent class, base class, or superclass. The class that inherits properties from the parent class is referred to as a child class, derived class, or subclass.

A subclass automatically takes on the behavior and attributes of its base class. In order to create several classes to describe types that are not identical but have many features in common, a base class can be created that defines all the common features. Then, subclasses can be created from the base class and can include modified or added features to distinguish itself from the base class. To create a subclass, the “extends” keyword is used to indicated the name of the base class, such as by the code:

public class ClassName extends BaseClass { // class body defined here }

Therefore, to create subclasses of UI elements that may be gaze-enabled (i.e., contain a supplemental information window 22 or other element to be displayed in the detailed display mode), the subclasses would be created from UI classes (e.g., ANDROID brand UI classes). The subclasses may then be modified as needed to include code to detect eye-gaze and render the detailed display mode of UI element. When no gaze is detected, the UI element would be rendered as its superclass is defined.

Utilizing the eye tracking functionality of the eye-gaze module 56, the eyes of the user can be monitored to determine where on the screen the user is looking. The display mode switching module 60 can analyze each UI element on any displayed page to see if they correspond to the eye tracking functionality to continually monitor if a position of a cursor represented by the user's eyes falls within the bounds of a corresponding UI element 18 or gaze target area 30, 32, 34 (FIG. 3). If the front-facing camera 16 and eye-gaze module 56 detect that the user's eyes are directed to the UI element 18 or gaze target area 30, 32, 34 for a predetermined amount of time (e.g., about two seconds), the UI control unit 52 switches to the detailed display mode.

When the front-facing camera 16 and eye-gaze module 52 detect that the user is no longer looking at the UI element 18 or the expanded display (i.e., the display including the supplemental information window 22), the UI control unit 52 is configured to return the user interface 48 back to the regular display mode or abbreviated state.

The UI control unit 52 may be provided as a downloadable application or software/firmware package. This would allow mobile devices to be upgraded to enable the user to interact with the UI to provide hands-free control of the UI. In addition to being hands-free, the UI display controller described in the present disclosure can provide a user experience that is directed to the intentions of the user as determined by the direction of gaze of the user and to avoid providing superfluous graphics that merely clutter the small screen of a mobile device. Therefore, the present invention overcomes the difficulties and issues that are typically inherent with display screens of most mobile devices.

To supplement the present disclosure, this application incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications:

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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation. 

The invention claimed is:
 1. A mobile device comprising: a display screen disposed of the mobile device, the display screen configured to display a user interface element for a user of the mobile device; a camera disposed of the mobile device, the camera configured to sense a characteristic of an eye of the user; a processing device configured to process the characteristic of the eye of the user to determine a corresponding point on the display screen where the eye of the user is directed; and a user interface control unit configured to: switch the display screen from a regular display mode to a detailed display mode when the processing device determines that the corresponding point on the display screen where the eye of the user is directed coincides with the user interface element, wherein the user interface control unit is configured to switch the display screen from the regular display mode to the detailed display mode based on determination that the eye of the user is directed to a first point on the display screen coinciding with the user interface element for at least a predetermined period of time, wherein the detailed display mode includes supplemental information related to the user interface element, switch the display screen from the detailed display mode back to the regular display mode based on the determination that the eye of the user is directed to a second point no longer coinciding with the user interface element or supplemental information for at least the predetermined period of time, and in an instance, when the display screen is switched from the detailed display mode to the regular display mode, further switch the display screen back from the regular display mode to the detailed display mode if the processing device determines that the eye of the user is directed back to the first point in a time period within the predetermined period of time, wherein the time period is shorter than the predetermined period of time.
 2. The mobile device of claim 1, wherein each of the user interface element is at least one of an image, a graphic, text, a text box, and a check box.
 3. The mobile device of claim 1, wherein the display screen is configured to display a plurality of user interface elements simultaneously.
 4. The mobile device of claim 1, wherein the regular display mode includes the user interface element in a simple format.
 5. The mobile device of claim 4, wherein the detailed display mode includes the user interface element selected by the user in the simple format and the supplemental information related to the user interface element superimposed over other non-selected user interface elements displayed on the display screen.
 6. The mobile device of claim 1, wherein the processing device is configured to determine whether or not the corresponding point on the display screen where the eye of the user is directed falls within a gaze target area, from amongst plurality of gaze target areas of the display screen, the gaze target area being associated with the user interface element.
 7. The mobile device of claim 6, wherein the gaze target area is a different size compared to the user interface element.
 8. The mobile device of claim 1, wherein the user interface control unit comprises a user interface element position monitoring module, a graphics buffer, and a display mode switching module.
 9. The mobile device of claim 8, wherein the user interface element position monitoring module is configured to determine a position of the user interface element on the display screen.
 10. The mobile device of claim 8, wherein the graphics buffer is configured to store the supplemental information related to the user interface element.
 11. The mobile device of claim 1, wherein the user interface control unit is configured to display a graphical indicator associated with the user interface element to indicate to the user that the detailed display mode is available.
 12. The mobile device of claim 1, further comprising a user input device configured to enable the user to set the predetermined period of time and the time period.
 13. The mobile device of claim 1, wherein at least one of the predetermined period of time and the time period is user-configurable.
 14. The mobile device of claim 1, wherein the user interface control unit is configured to display a graphical indicator associated with the user interface element to indicate to the user that the detailed display mode is available.
 15. A mobile device comprising: a body having a front side and a back side; a display device disposed on the front side of the body, the display device configured to display user interface elements simultaneously, at least one of the user interface elements comprising at least one of an image element and a text element; a camera disposed on the front side of the body, the camera configured to capture an image of an eye of a user when the user is viewing the display device; and a user interface control unit configured to: receive the image of the eye of the user from the camera; determine a direction that the eye of the user is pointed; determine a corresponding point on the display device where the eye of the user is directed; and switch between a regular display mode and a detailed display mode based on whether the corresponding point on the display device where the eye of the user is directed coincides with one of a plurality of gaze target areas, wherein the user interface control unit is configured to control the display device to switch a display screen of the display device from a regular display mode to the detailed display mode based on determination that the eye of the user is directed to a first point on the display screen coinciding with a gaze target area of the plurality of gaze target areas for at least a predetermined period of time, wherein each gaze target area is associated with a respective user interface element, switch the display screen from the detailed display mode back to the regular display mode based on the determination that the eye of the user is directed to a second point no longer coinciding with the gaze target area or another predetermined area for at least the predetermined period of time; and in an instance, when the display screen is switched from the detailed display mode to the regular display mode, further switch the display screen back from the regular display mode to the detailed display mode based on a determination that the eye of the user is directed back to the first point in a time-period within the predetermined period of time, wherein the time-period is shorter than the predetermined period of time.
 16. The mobile device of claim 15, wherein the detailed display mode includes a visually-selected user interface element and supplemental information related to the visually-selected user interface element superimposed over at least one other user interface element.
 17. The mobile device of claim 15, wherein the user interface control unit comprises: an eye-gaze module configured to determine a corresponding point on the display device where the eye of the user is directed; a user interface element position monitoring module configured to determine a position of the gaze target areas on the display device; a graphics buffer configured to store supplemental information related to the user interface elements; and a display mode switching module configured to switch between the regular display mode and the detailed display mode based on input from the eye-gaze module and user interface element position monitoring module.
 18. The mobile device of claim 15, wherein at least one of the predetermined period of time and the time-period is user-configurable.
 19. The mobile device of claim 15, wherein the display device comprises plurality of gaze target areas and wherein the user interface control unit is configured to determine whether or not the corresponding point on the display device where the eye of the user is directed falls within a gaze target area, from amongst plurality of gaze target areas of the display device, the gaze target area being associated with one or more user interface elements.
 20. A non-transitory computer-readable medium disposed in a mobile device storing an executable program being executable by a processing device disposed in the mobile device, the executable program comprising logic configured for: processing an image of an eye of a user of the mobile device to determine a corresponding point on a display screen of the mobile device where the eye of the user is directed; controlling visual features of the display screen based on whether or not the eye of the user is directed to a user interface element being displayed on the display screen, wherein controlling the visual features of the display screen comprises switching the display screen from a regular display mode to a detailed display mode when the eye of the user is directed to a first point on the display screen coinciding with the user interface element for at least a predetermined period of time, wherein the user interface element is an image element and/or a text element associated with supplemental information to be displayed in a detailed display mode; switching the display screen from the detailed display mode back to the regular display mode when the eye of the user is directed to a second point no longer coinciding with the user interface element or supplemental information for at least the predetermined period of time; and in an instance, when the display screen is switched from the detailed display mode to the regular display mode, further switching the display screen back from the regular display mode to the detailed display mode when the eye of the user is directed back to the first point in a time-period within the predetermined period of time, wherein the time-period is shorter than the predetermined period of time. 